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(A) : Noble gases have large positive electron gain enthalpy.
(R) : Noble gases have stable electronic configuration.

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(A) is true but (R) is false

Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

answer is A.

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Detailed Solution

Noble gases have stable closed shell electronic configuration. Thus, in order to add an electron to an isolated noble gas atom, energy have to given. Hence, noble gases have positive electron affinity.

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